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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: dc.cpp
3 // Purpose: wxDC class
4 // Author: Julian Smart
5 // Modified by:
6 // Created: 01/02/97
7 // RCS-ID: $Id$
8 // Copyright: (c) Julian Smart and Markus Holzem
9 // Licence: wxWindows licence
10 /////////////////////////////////////////////////////////////////////////////
11
12 // ===========================================================================
13 // declarations
14 // ===========================================================================
15
16 // ---------------------------------------------------------------------------
17 // headers
18 // ---------------------------------------------------------------------------
19
20 #ifdef __GNUG__
21 #pragma implementation "dc.h"
22 #endif
23
24 // For compilers that support precompilation, includes "wx.h".
25 #include "wx/wxprec.h"
26
27 #ifdef __BORLANDC__
28 #pragma hdrstop
29 #endif
30
31 #ifndef WX_PRECOMP
32 #include "wx/window.h"
33 #include "wx/dc.h"
34 #include "wx/utils.h"
35 #include "wx/dialog.h"
36 #include "wx/app.h"
37 #include "wx/bitmap.h"
38 #include "wx/dcmemory.h"
39 #include "wx/log.h"
40 #include "wx/icon.h"
41 #endif
42
43 #include "wx/dcprint.h"
44
45 #include <string.h>
46 #include <math.h>
47
48 #if wxUSE_COMMON_DIALOGS
49 #if wxUSE_NORLANDER_HEADERS
50 #include <windows.h>
51 #endif
52 #include <commdlg.h>
53 #endif
54
55 #ifndef __WIN32__
56 #include <print.h>
57 #endif
58
59 #include "wx/msw/private.h"
60
61 IMPLEMENT_ABSTRACT_CLASS(wxDC, wxObject)
62
63 // ---------------------------------------------------------------------------
64 // constants
65 // ---------------------------------------------------------------------------
66
67 static const int VIEWPORT_EXTENT = 1000;
68
69 static const int MM_POINTS = 9;
70 static const int MM_METRIC = 10;
71
72 // usually this is defined in math.h
73 #ifndef M_PI
74 static const double M_PI = 3.14159265358979323846;
75 #endif // M_PI
76
77 // ---------------------------------------------------------------------------
78 // private functions
79 // ---------------------------------------------------------------------------
80
81 // convert degrees to radians
82 static inline double DegToRad(double deg) { return (deg * M_PI) / 180.0; }
83
84 // ===========================================================================
85 // implementation
86 // ===========================================================================
87
88 // ---------------------------------------------------------------------------
89 // wxDC
90 // ---------------------------------------------------------------------------
91
92 // Default constructor
93 wxDC::wxDC()
94 {
95 m_canvas = NULL;
96
97 m_oldBitmap = 0;
98 m_oldPen = 0;
99 m_oldBrush = 0;
100 m_oldFont = 0;
101 m_oldPalette = 0;
102
103 m_bOwnsDC = FALSE;
104 m_hDC = 0;
105
106 m_windowExtX = VIEWPORT_EXTENT;
107 m_windowExtY = VIEWPORT_EXTENT;
108
109 m_hDCCount = 0;
110 }
111
112
113 wxDC::~wxDC()
114 {
115 if ( m_hDC != 0 ) {
116 SelectOldObjects(m_hDC);
117 if ( m_bOwnsDC ) {
118 if ( m_canvas == NULL )
119 ::DeleteDC(GetHdc());
120 else
121 ::ReleaseDC((HWND)m_canvas->GetHWND(), GetHdc());
122 }
123 }
124
125 }
126
127 // This will select current objects out of the DC,
128 // which is what you have to do before deleting the
129 // DC.
130 void wxDC::SelectOldObjects(WXHDC dc)
131 {
132 if (dc)
133 {
134 if (m_oldBitmap)
135 {
136 ::SelectObject((HDC) dc, (HBITMAP) m_oldBitmap);
137 if (m_selectedBitmap.Ok())
138 {
139 m_selectedBitmap.SetSelectedInto(NULL);
140 }
141 }
142 m_oldBitmap = 0;
143 if (m_oldPen)
144 {
145 ::SelectObject((HDC) dc, (HPEN) m_oldPen);
146 }
147 m_oldPen = 0;
148 if (m_oldBrush)
149 {
150 ::SelectObject((HDC) dc, (HBRUSH) m_oldBrush);
151 }
152 m_oldBrush = 0;
153 if (m_oldFont)
154 {
155 ::SelectObject((HDC) dc, (HFONT) m_oldFont);
156 }
157 m_oldFont = 0;
158 if (m_oldPalette)
159 {
160 ::SelectPalette((HDC) dc, (HPALETTE) m_oldPalette, TRUE);
161 }
162 m_oldPalette = 0;
163 }
164
165 m_brush = wxNullBrush;
166 m_pen = wxNullPen;
167 m_palette = wxNullPalette;
168 m_font = wxNullFont;
169 m_backgroundBrush = wxNullBrush;
170 m_selectedBitmap = wxNullBitmap;
171 }
172
173 // ---------------------------------------------------------------------------
174 // clipping
175 // ---------------------------------------------------------------------------
176
177 void wxDC::DoSetClippingRegion(wxCoord cx, wxCoord cy, wxCoord cw, wxCoord ch)
178 {
179 m_clipping = TRUE;
180 m_clipX1 = (int)cx;
181 m_clipY1 = (int)cy;
182 m_clipX2 = (int)(cx + cw);
183 m_clipY2 = (int)(cy + ch);
184
185 DoClipping((WXHDC) m_hDC);
186 }
187
188 void wxDC::DoSetClippingRegionAsRegion(const wxRegion& region)
189 {
190 wxCHECK_RET( region.GetHRGN(), wxT("invalid clipping region") );
191
192 wxRect box = region.GetBox();
193
194 m_clipping = TRUE;
195 m_clipX1 = box.x;
196 m_clipY1 = box.y;
197 m_clipX2 = box.x + box.width;
198 m_clipY2 = box.y + box.height;
199
200 #ifdef __WIN16__
201 SelectClipRgn(GetHdc(), (HRGN) region.GetHRGN());
202 #else
203 ExtSelectClipRgn(GetHdc(), (HRGN) region.GetHRGN(), RGN_AND);
204 #endif
205 }
206
207 void wxDC::DoClipping(WXHDC dc)
208 {
209 if (m_clipping && dc)
210 {
211 IntersectClipRect((HDC) dc, XLOG2DEV(m_clipX1), YLOG2DEV(m_clipY1),
212 XLOG2DEV(m_clipX2), YLOG2DEV(m_clipY2));
213 }
214 }
215
216 void wxDC::DestroyClippingRegion()
217 {
218 if (m_clipping && m_hDC)
219 {
220 // TODO: this should restore the previous clipping region,
221 // so that OnPaint processing works correctly, and the update clipping region
222 // doesn't get destroyed after the first DestroyClippingRegion.
223 HRGN rgn = CreateRectRgn(0, 0, 32000, 32000);
224 SelectClipRgn(GetHdc(), rgn);
225 DeleteObject(rgn);
226 }
227 m_clipping = FALSE;
228 }
229
230 // ---------------------------------------------------------------------------
231 // query capabilities
232 // ---------------------------------------------------------------------------
233
234 bool wxDC::CanDrawBitmap() const
235 {
236 return TRUE;
237 }
238
239 bool wxDC::CanGetTextExtent() const
240 {
241 // What sort of display is it?
242 int technology = ::GetDeviceCaps(GetHdc(), TECHNOLOGY);
243
244 return (technology == DT_RASDISPLAY) || (technology == DT_RASPRINTER);
245 }
246
247 int wxDC::GetDepth() const
248 {
249 return (int)::GetDeviceCaps(GetHdc(), BITSPIXEL);
250 }
251
252 // ---------------------------------------------------------------------------
253 // drawing
254 // ---------------------------------------------------------------------------
255
256 void wxDC::Clear()
257 {
258 RECT rect;
259 if ( m_canvas )
260 {
261 GetClientRect((HWND) m_canvas->GetHWND(), &rect);
262 }
263 else
264 {
265 wxCHECK_RET( m_selectedBitmap.Ok(), wxT("this DC can't be cleared") );
266
267 rect.left = 0; rect.top = 0;
268 rect.right = m_selectedBitmap.GetWidth();
269 rect.bottom = m_selectedBitmap.GetHeight();
270 }
271
272 (void) ::SetMapMode(GetHdc(), MM_TEXT);
273
274 DWORD colour = GetBkColor(GetHdc());
275 HBRUSH brush = CreateSolidBrush(colour);
276 FillRect(GetHdc(), &rect, brush);
277 DeleteObject(brush);
278
279 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
280 ::SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
281 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
282 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
283 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
284 }
285
286 void wxDC::DoFloodFill(wxCoord x, wxCoord y, const wxColour& col, int style)
287 {
288 (void)ExtFloodFill(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
289 col.GetPixel(),
290 style == wxFLOOD_SURFACE ? FLOODFILLSURFACE
291 : FLOODFILLBORDER);
292
293 CalcBoundingBox(x, y);
294 }
295
296 bool wxDC::DoGetPixel(wxCoord x, wxCoord y, wxColour *col) const
297 {
298 // added by steve 29.12.94 (copied from DrawPoint)
299 // returns TRUE for pixels in the color of the current pen
300 // and FALSE for all other pixels colors
301 // if col is non-NULL return the color of the pixel
302
303 // get the color of the pixel
304 COLORREF pixelcolor = ::GetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y));
305 // get the color of the pen
306 COLORREF pencolor = 0x00ffffff;
307 if (m_pen.Ok())
308 {
309 pencolor = m_pen.GetColour().GetPixel();
310 }
311
312 // return the color of the pixel
313 if(col)
314 col->Set(GetRValue(pixelcolor),GetGValue(pixelcolor),GetBValue(pixelcolor));
315
316 // check, if color of the pixels is the same as the color
317 // of the current pen
318 return(pixelcolor==pencolor);
319 }
320
321 void wxDC::DoCrossHair(wxCoord x, wxCoord y)
322 {
323 wxCoord x1 = x-VIEWPORT_EXTENT;
324 wxCoord y1 = y-VIEWPORT_EXTENT;
325 wxCoord x2 = x+VIEWPORT_EXTENT;
326 wxCoord y2 = y+VIEWPORT_EXTENT;
327
328 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y), NULL);
329 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y));
330
331 (void)MoveToEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y1), NULL);
332 (void)LineTo(GetHdc(), XLOG2DEV(x), YLOG2DEV(y2));
333
334 CalcBoundingBox(x1, y1);
335 CalcBoundingBox(x2, y2);
336 }
337
338 void wxDC::DoDrawLine(wxCoord x1, wxCoord y1, wxCoord x2, wxCoord y2)
339 {
340 (void)MoveToEx(GetHdc(), XLOG2DEV(x1), YLOG2DEV(y1), NULL);
341 (void)LineTo(GetHdc(), XLOG2DEV(x2), YLOG2DEV(y2));
342
343 /* MATTHEW: [6] New normalization */
344 #if WX_STANDARD_GRAPHICS
345 (void)LineTo(GetHdc(), XLOG2DEV(x2) + 1, YLOG2DEV(y2));
346 #endif
347
348 CalcBoundingBox(x1, y1);
349 CalcBoundingBox(x2, y2);
350 }
351
352 void wxDC::DoDrawArc(wxCoord x1,wxCoord y1,wxCoord x2,wxCoord y2, wxCoord xc, wxCoord yc)
353 {
354 double dx = xc-x1;
355 double dy = yc-y1;
356 double radius = (double)sqrt(dx*dx+dy*dy) ;;
357 if (x1==x2 && x2==y2)
358 {
359 DrawEllipse(xc,yc,(wxCoord)(radius*2.0),(wxCoord)(radius*2.0));
360 return;
361 }
362
363 wxCoord xx1 = XLOG2DEV(x1);
364 wxCoord yy1 = YLOG2DEV(y1);
365 wxCoord xx2 = XLOG2DEV(x2);
366 wxCoord yy2 = YLOG2DEV(y2);
367 wxCoord xxc = XLOG2DEV(xc);
368 wxCoord yyc = YLOG2DEV(yc);
369 wxCoord ray = (wxCoord) sqrt(double((xxc-xx1)*(xxc-xx1)+(yyc-yy1)*(yyc-yy1)));
370
371 (void)MoveToEx(GetHdc(), (int) xx1, (int) yy1, NULL);
372 wxCoord xxx1 = (wxCoord) (xxc-ray);
373 wxCoord yyy1 = (wxCoord) (yyc-ray);
374 wxCoord xxx2 = (wxCoord) (xxc+ray);
375 wxCoord yyy2 = (wxCoord) (yyc+ray);
376 if (m_brush.Ok() && m_brush.GetStyle() !=wxTRANSPARENT)
377 {
378 // Have to add 1 to bottom-right corner of rectangle
379 // to make semi-circles look right (crooked line otherwise).
380 // Unfortunately this is not a reliable method, depends
381 // on the size of shape.
382 // TODO: figure out why this happens!
383 Pie(GetHdc(),xxx1,yyy1,xxx2+1,yyy2+1,
384 xx1,yy1,xx2,yy2);
385 }
386 else
387 Arc(GetHdc(),xxx1,yyy1,xxx2,yyy2,
388 xx1,yy1,xx2,yy2);
389
390 CalcBoundingBox((wxCoord)(xc-radius), (wxCoord)(yc-radius));
391 CalcBoundingBox((wxCoord)(xc+radius), (wxCoord)(yc+radius));
392 }
393
394 void wxDC::DoDrawPoint(wxCoord x, wxCoord y)
395 {
396 COLORREF color = 0x00ffffff;
397 if (m_pen.Ok())
398 {
399 color = m_pen.GetColour().GetPixel();
400 }
401
402 SetPixel(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), color);
403
404 CalcBoundingBox(x, y);
405 }
406
407 void wxDC::DoDrawPolygon(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset,int fillStyle)
408 {
409 // Do things less efficiently if we have offsets
410 if (xoffset != 0 || yoffset != 0)
411 {
412 POINT *cpoints = new POINT[n];
413 int i;
414 for (i = 0; i < n; i++)
415 {
416 cpoints[i].x = (int)(points[i].x + xoffset);
417 cpoints[i].y = (int)(points[i].y + yoffset);
418
419 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
420 }
421 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
422 (void)Polygon(GetHdc(), cpoints, n);
423 SetPolyFillMode(GetHdc(),prev);
424 delete[] cpoints;
425 }
426 else
427 {
428 int i;
429 for (i = 0; i < n; i++)
430 CalcBoundingBox(points[i].x, points[i].y);
431
432 int prev = SetPolyFillMode(GetHdc(),fillStyle==wxODDEVEN_RULE?ALTERNATE:WINDING);
433 (void)Polygon(GetHdc(), (POINT*) points, n);
434 SetPolyFillMode(GetHdc(),prev);
435 }
436 }
437
438 void wxDC::DoDrawLines(int n, wxPoint points[], wxCoord xoffset, wxCoord yoffset)
439 {
440 // Do things less efficiently if we have offsets
441 if (xoffset != 0 || yoffset != 0)
442 {
443 POINT *cpoints = new POINT[n];
444 int i;
445 for (i = 0; i < n; i++)
446 {
447 cpoints[i].x = (int)(points[i].x + xoffset);
448 cpoints[i].y = (int)(points[i].y + yoffset);
449
450 CalcBoundingBox(cpoints[i].x, cpoints[i].y);
451 }
452 (void)Polyline(GetHdc(), cpoints, n);
453 delete[] cpoints;
454 }
455 else
456 {
457 int i;
458 for (i = 0; i < n; i++)
459 CalcBoundingBox(points[i].x, points[i].y);
460
461 (void)Polyline(GetHdc(), (POINT*) points, n);
462 }
463 }
464
465 void wxDC::DoDrawRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
466 {
467 wxCoord x2 = x + width;
468 wxCoord y2 = y + height;
469
470 /* MATTHEW: [6] new normalization */
471 #if WX_STANDARD_GRAPHICS
472 bool do_brush, do_pen;
473
474 do_brush = m_brush.Ok() && m_brush.GetStyle() != wxTRANSPARENT;
475 do_pen = m_pen.Ok() && m_pen.GetStyle() != wxTRANSPARENT;
476
477 if (do_brush) {
478 HPEN orig_pen = NULL;
479
480 if (do_pen || !m_pen.Ok())
481 orig_pen = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
482
483 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
484 XLOG2DEV(x2) + 1, YLOG2DEV(y2) + 1);
485
486 if (do_pen || !m_pen.Ok())
487 ::SelectObject(GetHdc() , orig_pen);
488 }
489 if (do_pen) {
490 HBRUSH orig_brush = NULL;
491
492 if (do_brush || !m_brush.Ok())
493 orig_brush = (HBRUSH) ::SelectObject(GetHdc(), (HBRUSH) ::GetStockObject(NULL_BRUSH));
494
495 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
496 XLOG2DEV(x2), YLOG2DEV(y2));
497
498 if (do_brush || !m_brush.Ok())
499 ::SelectObject(GetHdc(), orig_brush);
500 }
501 #else
502 (void)Rectangle(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
503 #endif
504
505 CalcBoundingBox(x, y);
506 CalcBoundingBox(x2, y2);
507 }
508
509 void wxDC::DoDrawRoundedRectangle(wxCoord x, wxCoord y, wxCoord width, wxCoord height, double radius)
510 {
511 // Now, a negative radius value is interpreted to mean
512 // 'the proportion of the smallest X or Y dimension'
513
514 if (radius < 0.0)
515 {
516 double smallest = 0.0;
517 if (width < height)
518 smallest = width;
519 else
520 smallest = height;
521 radius = (- radius * smallest);
522 }
523
524 wxCoord x2 = (x+width);
525 wxCoord y2 = (y+height);
526
527 (void)RoundRect(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2),
528 YLOG2DEV(y2), (int) (2*XLOG2DEV(radius)), (int)( 2*YLOG2DEV(radius)));
529
530 CalcBoundingBox(x, y);
531 CalcBoundingBox(x2, y2);
532 }
533
534 void wxDC::DoDrawEllipse(wxCoord x, wxCoord y, wxCoord width, wxCoord height)
535 {
536 wxCoord x2 = (x+width);
537 wxCoord y2 = (y+height);
538
539 (void)Ellipse(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2));
540
541 CalcBoundingBox(x, y);
542 CalcBoundingBox(x2, y2);
543 }
544
545 // Chris Breeze 20/5/98: first implementation of DrawEllipticArc on Windows
546 void wxDC::DoDrawEllipticArc(wxCoord x,wxCoord y,wxCoord w,wxCoord h,double sa,double ea)
547 {
548 wxCoord x2 = (x+w);
549 wxCoord y2 = (y+h);
550
551 int rx1 = XLOG2DEV(x+w/2);
552 int ry1 = YLOG2DEV(y+h/2);
553 int rx2 = rx1;
554 int ry2 = ry1;
555
556 sa = DegToRad(sa);
557 ea = DegToRad(ea);
558
559 rx1 += (int)(100.0 * abs(w) * cos(sa));
560 ry1 -= (int)(100.0 * abs(h) * m_signY * sin(sa));
561 rx2 += (int)(100.0 * abs(w) * cos(ea));
562 ry2 -= (int)(100.0 * abs(h) * m_signY * sin(ea));
563
564 // draw pie with NULL_PEN first and then outline otherwise a line is
565 // drawn from the start and end points to the centre
566 HPEN orig_pen = (HPEN) ::SelectObject(GetHdc(), (HPEN) ::GetStockObject(NULL_PEN));
567 if (m_signY > 0)
568 {
569 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2)+1, YLOG2DEV(y2)+1,
570 rx1, ry1, rx2, ry2);
571 }
572 else
573 {
574 (void)Pie(GetHdc(), XLOG2DEV(x), YLOG2DEV(y)-1, XLOG2DEV(x2)+1, YLOG2DEV(y2),
575 rx1, ry1-1, rx2, ry2-1);
576 }
577 ::SelectObject(GetHdc(), orig_pen);
578 (void)Arc(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), XLOG2DEV(x2), YLOG2DEV(y2),
579 rx1, ry1, rx2, ry2);
580
581 CalcBoundingBox(x, y);
582 CalcBoundingBox(x2, y2);
583 }
584
585 void wxDC::DoDrawIcon(const wxIcon& icon, wxCoord x, wxCoord y)
586 {
587 #if defined(__WIN32__) && !defined(__SC__) && !defined(__TWIN32__)
588 ::DrawIconEx(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), (HICON) icon.GetHICON(),
589 icon.GetWidth(), icon.GetHeight(), 0, 0, DI_NORMAL);
590 #else
591 ::DrawIcon(GetHdc(), XLOG2DEV(x), YLOG2DEV(y), (HICON) icon.GetHICON());
592 #endif
593
594 CalcBoundingBox(x, y);
595 CalcBoundingBox(x+icon.GetWidth(), y+icon.GetHeight());
596 }
597
598 void wxDC::DoDrawBitmap( const wxBitmap &bmp, wxCoord x, wxCoord y, bool useMask )
599 {
600 if (!bmp.Ok())
601 return;
602
603 // If we're not drawing transparently, and not drawing to a printer,
604 // optimize this function to use Windows functions.
605 if (!useMask && !IsKindOf(CLASSINFO(wxPrinterDC)))
606 {
607 HDC cdc = GetHdc();
608 HDC memdc = ::CreateCompatibleDC( cdc );
609 HBITMAP hbitmap = (HBITMAP) bmp.GetHBITMAP( );
610
611 wxASSERT_MSG( hbitmap, wxT("bitmap is ok but HBITMAP is NULL?") );
612
613 ::SelectObject( memdc, hbitmap );
614 ::BitBlt( cdc, x, y, bmp.GetWidth(), bmp.GetHeight(), memdc, 0, 0, SRCCOPY);
615 ::DeleteDC( memdc );
616 }
617 else
618 {
619 // Rather than reproduce wxDC::Blit, let's do it at the wxWin API level
620 wxMemoryDC memDC;
621 memDC.SelectObject(bmp);
622
623 /* Not sure if we need this. The mask should leave the
624 * masked areas as per the original background of this DC.
625 */
626 /*
627 // There might be transparent areas, so make these
628 // the same colour as this DC
629 memDC.SetBackground(* GetBackground());
630 memDC.Clear();
631 */
632
633 Blit(x, y, bmp.GetWidth(), bmp.GetHeight(), & memDC, 0, 0, wxCOPY, useMask);
634
635 memDC.SelectObject(wxNullBitmap);
636 }
637 }
638
639 void wxDC::DoDrawText(const wxString& text, wxCoord x, wxCoord y)
640 {
641 DrawAnyText(text, x, y);
642
643 // update the bounding box
644 CalcBoundingBox(x, y);
645
646 wxCoord w, h;
647 GetTextExtent(text, &w, &h);
648 CalcBoundingBox(x + w, y + h);
649 }
650
651 void wxDC::DrawAnyText(const wxString& text, wxCoord x, wxCoord y)
652 {
653 // prepare for drawing the text
654 if ( m_textForegroundColour.Ok() )
655 SetTextColor(GetHdc(), m_textForegroundColour.GetPixel());
656
657 DWORD old_background = 0;
658 if ( m_textBackgroundColour.Ok() )
659 {
660 old_background = SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
661 }
662
663 SetBkMode(GetHdc(), m_backgroundMode == wxTRANSPARENT ? TRANSPARENT
664 : OPAQUE);
665
666 if ( ::TextOut(GetHdc(), XLOG2DEV(x), YLOG2DEV(y),
667 text.c_str(), text.length()) == 0 )
668 {
669 wxLogLastError("TextOut");
670 }
671
672 // restore the old parameters (text foreground colour may be left because
673 // it never is set to anything else, but background should remain
674 // transparent even if we just drew an opaque string)
675 if ( m_textBackgroundColour.Ok() )
676 (void)SetBkColor(GetHdc(), old_background);
677
678 SetBkMode(GetHdc(), TRANSPARENT);
679 }
680
681 void wxDC::DoDrawRotatedText(const wxString& text,
682 wxCoord x, wxCoord y,
683 double angle)
684 {
685 // we test that we have some font because otherwise we should still use the
686 // "else" part below to avoid that DrawRotatedText(angle = 180) and
687 // DrawRotatedText(angle = 0) use different fonts (we can't use the default
688 // font for drawing rotated fonts unfortunately)
689 if ( (angle == 0.0) && m_font.Ok() )
690 {
691 DoDrawText(text, x, y);
692 }
693 else
694 {
695 // NB: don't take DEFAULT_GUI_FONT because it's not TrueType and so
696 // can't have non zero orientation/escapement
697 wxFont font = m_font.Ok() ? m_font : *wxNORMAL_FONT;
698 HFONT hfont = (HFONT)font.GetResourceHandle();
699 LOGFONT lf;
700 if ( ::GetObject(hfont, sizeof(lf), &lf) == 0 )
701 {
702 wxLogLastError("GetObject(hfont)");
703 }
704
705 // GDI wants the angle in tenth of degree
706 long angle10 = (long)(angle * 10);
707 lf.lfEscapement = angle10;
708 lf. lfOrientation = angle10;
709
710 hfont = ::CreateFontIndirect(&lf);
711 if ( !hfont )
712 {
713 wxLogLastError("CreateFont");
714 }
715 else
716 {
717 HFONT hfontOld = (HFONT)::SelectObject(GetHdc(), hfont);
718
719 DrawAnyText(text, x, y);
720
721 (void)::SelectObject(GetHdc(), hfontOld);
722 }
723
724 // call the bounding box by adding all four vertices of the rectangle
725 // containing the text to it (simpler and probably not slower than
726 // determining which of them is really topmost/leftmost/...)
727 wxCoord w, h;
728 GetTextExtent(text, &w, &h);
729
730 double rad = DegToRad(angle);
731
732 // "upper left" and "upper right"
733 CalcBoundingBox(x, y);
734 CalcBoundingBox(x + w*cos(rad), y - h*sin(rad));
735
736 // "bottom left" and "bottom right"
737 x += (wxCoord)(h*sin(rad));
738 y += (wxCoord)(h*cos(rad));
739 CalcBoundingBox(x, y);
740 CalcBoundingBox(x + h*sin(rad), y + h*cos(rad));
741 }
742 }
743
744 // ---------------------------------------------------------------------------
745 // set GDI objects
746 // ---------------------------------------------------------------------------
747
748 void wxDC::SetPalette(const wxPalette& palette)
749 {
750 // Set the old object temporarily, in case the assignment deletes an object
751 // that's not yet selected out.
752 if (m_oldPalette)
753 {
754 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
755 m_oldPalette = 0;
756 }
757
758 m_palette = palette;
759
760 if (!m_palette.Ok())
761 {
762 // Setting a NULL colourmap is a way of restoring
763 // the original colourmap
764 if (m_oldPalette)
765 {
766 ::SelectPalette(GetHdc(), (HPALETTE) m_oldPalette, TRUE);
767 m_oldPalette = 0;
768 }
769
770 return;
771 }
772
773 if (m_palette.Ok() && m_palette.GetHPALETTE())
774 {
775 HPALETTE oldPal = ::SelectPalette(GetHdc(), (HPALETTE) m_palette.GetHPALETTE(), TRUE);
776 if (!m_oldPalette)
777 m_oldPalette = (WXHPALETTE) oldPal;
778
779 ::RealizePalette(GetHdc());
780 }
781 }
782
783 void wxDC::SetFont(const wxFont& the_font)
784 {
785 // Set the old object temporarily, in case the assignment deletes an object
786 // that's not yet selected out.
787 if (m_oldFont)
788 {
789 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
790 m_oldFont = 0;
791 }
792
793 m_font = the_font;
794
795 if (!the_font.Ok())
796 {
797 if (m_oldFont)
798 ::SelectObject(GetHdc(), (HFONT) m_oldFont);
799 m_oldFont = 0;
800 }
801
802 if (m_font.Ok() && m_font.GetResourceHandle())
803 {
804 HFONT f = (HFONT) ::SelectObject(GetHdc(), (HFONT) m_font.GetResourceHandle());
805 if (f == (HFONT) NULL)
806 {
807 wxLogDebug(wxT("::SelectObject failed in wxDC::SetFont."));
808 }
809 if (!m_oldFont)
810 m_oldFont = (WXHFONT) f;
811 }
812 }
813
814 void wxDC::SetPen(const wxPen& pen)
815 {
816 // Set the old object temporarily, in case the assignment deletes an object
817 // that's not yet selected out.
818 if (m_oldPen)
819 {
820 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
821 m_oldPen = 0;
822 }
823
824 m_pen = pen;
825
826 if (!m_pen.Ok())
827 {
828 if (m_oldPen)
829 ::SelectObject(GetHdc(), (HPEN) m_oldPen);
830 m_oldPen = 0;
831 }
832
833 if (m_pen.Ok())
834 {
835 if (m_pen.GetResourceHandle())
836 {
837 HPEN p = (HPEN) ::SelectObject(GetHdc(), (HPEN)m_pen.GetResourceHandle());
838 if (!m_oldPen)
839 m_oldPen = (WXHPEN) p;
840 }
841 }
842 }
843
844 void wxDC::SetBrush(const wxBrush& brush)
845 {
846 // Set the old object temporarily, in case the assignment deletes an object
847 // that's not yet selected out.
848 if (m_oldBrush)
849 {
850 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
851 m_oldBrush = 0;
852 }
853
854 m_brush = brush;
855
856 if (!m_brush.Ok())
857 {
858 if (m_oldBrush)
859 ::SelectObject(GetHdc(), (HBRUSH) m_oldBrush);
860 m_oldBrush = 0;
861 }
862
863 if (m_brush.Ok())
864 {
865 if (m_brush.GetResourceHandle())
866 {
867 HBRUSH b = 0;
868 b = (HBRUSH) ::SelectObject(GetHdc(), (HBRUSH)m_brush.GetResourceHandle());
869 if (!m_oldBrush)
870 m_oldBrush = (WXHBRUSH) b;
871 }
872 }
873 }
874
875 void wxDC::SetBackground(const wxBrush& brush)
876 {
877 m_backgroundBrush = brush;
878
879 if (!m_backgroundBrush.Ok())
880 return;
881
882 if (m_canvas)
883 {
884 bool customColours = TRUE;
885 // If we haven't specified wxUSER_COLOURS, don't allow the panel/dialog box to
886 // change background colours from the control-panel specified colours.
887 if (m_canvas->IsKindOf(CLASSINFO(wxWindow)) && ((m_canvas->GetWindowStyleFlag() & wxUSER_COLOURS) != wxUSER_COLOURS))
888 customColours = FALSE;
889
890 if (customColours)
891 {
892 if (m_backgroundBrush.GetStyle()==wxTRANSPARENT)
893 {
894 m_canvas->SetTransparent(TRUE);
895 }
896 else
897 {
898 // New behaviour, 10/2/99: setting the background brush of a DC
899 // doesn't affect the window background colour. However,
900 // I'm leaving in the transparency setting because it's needed by
901 // various controls (e.g. wxStaticText) to determine whether to draw
902 // transparently or not. TODO: maybe this should be a new function
903 // wxWindow::SetTransparency(). Should that apply to the child itself, or the
904 // parent?
905 // m_canvas->SetBackgroundColour(m_backgroundBrush.GetColour());
906 m_canvas->SetTransparent(FALSE);
907 }
908 }
909 }
910 COLORREF new_color = m_backgroundBrush.GetColour().GetPixel();
911 {
912 (void)SetBkColor(GetHdc(), new_color);
913 }
914 }
915
916 void wxDC::SetBackgroundMode(int mode)
917 {
918 m_backgroundMode = mode;
919
920 // SetBackgroundColour now only refers to text background
921 // and m_backgroundMode is used there
922
923 /*
924 if (m_backgroundMode == wxTRANSPARENT)
925 ::SetBkMode(GetHdc(), TRANSPARENT);
926 else
927 ::SetBkMode(GetHdc(), OPAQUE);
928 */
929 }
930
931 void wxDC::SetLogicalFunction(int function)
932 {
933 m_logicalFunction = function;
934
935 SetRop((WXHDC) m_hDC);
936 }
937
938 void wxDC::SetRop(WXHDC dc)
939 {
940 if (!dc || m_logicalFunction < 0)
941 return;
942
943 int c_rop;
944 // These may be wrong
945 switch (m_logicalFunction)
946 {
947 // case wxXOR: c_rop = R2_XORPEN; break;
948 case wxXOR: c_rop = R2_NOTXORPEN; break;
949 case wxINVERT: c_rop = R2_NOT; break;
950 case wxOR_REVERSE: c_rop = R2_MERGEPENNOT; break;
951 case wxAND_REVERSE: c_rop = R2_MASKPENNOT; break;
952 case wxCLEAR: c_rop = R2_WHITE; break;
953 case wxSET: c_rop = R2_BLACK; break;
954 case wxSRC_INVERT: c_rop = R2_NOTCOPYPEN; break;
955 case wxOR_INVERT: c_rop = R2_MERGENOTPEN; break;
956 case wxAND: c_rop = R2_MASKPEN; break;
957 case wxOR: c_rop = R2_MERGEPEN; break;
958 case wxAND_INVERT: c_rop = R2_MASKNOTPEN; break;
959 case wxEQUIV:
960 case wxNAND:
961 case wxCOPY:
962 default:
963 c_rop = R2_COPYPEN; break;
964 }
965 SetROP2((HDC) dc, c_rop);
966 }
967
968 bool wxDC::StartDoc(const wxString& message)
969 {
970 // We might be previewing, so return TRUE to let it continue.
971 return TRUE;
972 }
973
974 void wxDC::EndDoc()
975 {
976 }
977
978 void wxDC::StartPage()
979 {
980 }
981
982 void wxDC::EndPage()
983 {
984 }
985
986 // ---------------------------------------------------------------------------
987 // text metrics
988 // ---------------------------------------------------------------------------
989
990 wxCoord wxDC::GetCharHeight() const
991 {
992 TEXTMETRIC lpTextMetric;
993
994 GetTextMetrics(GetHdc(), &lpTextMetric);
995
996 return YDEV2LOGREL(lpTextMetric.tmHeight);
997 }
998
999 wxCoord wxDC::GetCharWidth() const
1000 {
1001 TEXTMETRIC lpTextMetric;
1002
1003 GetTextMetrics(GetHdc(), &lpTextMetric);
1004
1005 return XDEV2LOGREL(lpTextMetric.tmAveCharWidth);
1006 }
1007
1008 void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
1009 wxCoord *descent, wxCoord *externalLeading,
1010 wxFont *theFont) const
1011 {
1012 wxFont *fontToUse = (wxFont*) theFont;
1013 if (!fontToUse)
1014 fontToUse = (wxFont*) &m_font;
1015
1016 SIZE sizeRect;
1017 TEXTMETRIC tm;
1018
1019 GetTextExtentPoint(GetHdc(), WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
1020 GetTextMetrics(GetHdc(), &tm);
1021
1022 if (x) *x = XDEV2LOGREL(sizeRect.cx);
1023 if (y) *y = YDEV2LOGREL(sizeRect.cy);
1024 if (descent) *descent = tm.tmDescent;
1025 if (externalLeading) *externalLeading = tm.tmExternalLeading;
1026 }
1027
1028 void wxDC::SetMapMode(int mode)
1029 {
1030 m_mappingMode = mode;
1031
1032 int pixel_width = 0;
1033 int pixel_height = 0;
1034 int mm_width = 0;
1035 int mm_height = 0;
1036
1037 pixel_width = GetDeviceCaps(GetHdc(), HORZRES);
1038 pixel_height = GetDeviceCaps(GetHdc(), VERTRES);
1039 mm_width = GetDeviceCaps(GetHdc(), HORZSIZE);
1040 mm_height = GetDeviceCaps(GetHdc(), VERTSIZE);
1041
1042 if ((pixel_width == 0) || (pixel_height == 0) || (mm_width == 0) || (mm_height == 0))
1043 {
1044 return;
1045 }
1046
1047 double mm2pixelsX = pixel_width/mm_width;
1048 double mm2pixelsY = pixel_height/mm_height;
1049
1050 switch (mode)
1051 {
1052 case wxMM_TWIPS:
1053 {
1054 m_logicalScaleX = (twips2mm * mm2pixelsX);
1055 m_logicalScaleY = (twips2mm * mm2pixelsY);
1056 break;
1057 }
1058 case wxMM_POINTS:
1059 {
1060 m_logicalScaleX = (pt2mm * mm2pixelsX);
1061 m_logicalScaleY = (pt2mm * mm2pixelsY);
1062 break;
1063 }
1064 case wxMM_METRIC:
1065 {
1066 m_logicalScaleX = mm2pixelsX;
1067 m_logicalScaleY = mm2pixelsY;
1068 break;
1069 }
1070 case wxMM_LOMETRIC:
1071 {
1072 m_logicalScaleX = (mm2pixelsX/10.0);
1073 m_logicalScaleY = (mm2pixelsY/10.0);
1074 break;
1075 }
1076 default:
1077 case wxMM_TEXT:
1078 {
1079 m_logicalScaleX = 1.0;
1080 m_logicalScaleY = 1.0;
1081 break;
1082 }
1083 }
1084
1085 if (::GetMapMode(GetHdc()) != MM_ANISOTROPIC)
1086 ::SetMapMode(GetHdc(), MM_ANISOTROPIC);
1087
1088 SetViewportExtEx(GetHdc(), VIEWPORT_EXTENT, VIEWPORT_EXTENT, NULL);
1089 m_windowExtX = (int)MS_XDEV2LOGREL(VIEWPORT_EXTENT);
1090 m_windowExtY = (int)MS_YDEV2LOGREL(VIEWPORT_EXTENT);
1091 ::SetWindowExtEx(GetHdc(), m_windowExtX, m_windowExtY, NULL);
1092 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1093 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1094 }
1095
1096 void wxDC::SetUserScale(double x, double y)
1097 {
1098 m_userScaleX = x;
1099 m_userScaleY = y;
1100
1101 SetMapMode(m_mappingMode);
1102 }
1103
1104 void wxDC::SetAxisOrientation(bool xLeftRight, bool yBottomUp)
1105 {
1106 m_signX = xLeftRight ? 1 : -1;
1107 m_signY = yBottomUp ? -1 : 1;
1108
1109 SetMapMode(m_mappingMode);
1110 }
1111
1112 void wxDC::SetSystemScale(double x, double y)
1113 {
1114 m_scaleX = x;
1115 m_scaleY = y;
1116
1117 SetMapMode(m_mappingMode);
1118 }
1119
1120 void wxDC::SetLogicalOrigin(wxCoord x, wxCoord y)
1121 {
1122 m_logicalOriginX = x;
1123 m_logicalOriginY = y;
1124
1125 ::SetWindowOrgEx(GetHdc(), (int)m_logicalOriginX, (int)m_logicalOriginY, NULL);
1126 }
1127
1128 void wxDC::SetDeviceOrigin(wxCoord x, wxCoord y)
1129 {
1130 m_deviceOriginX = x;
1131 m_deviceOriginY = y;
1132
1133 ::SetViewportOrgEx(GetHdc(), (int)m_deviceOriginX, (int)m_deviceOriginY, NULL);
1134 }
1135
1136 // ---------------------------------------------------------------------------
1137 // coordinates transformations
1138 // ---------------------------------------------------------------------------
1139
1140 wxCoord wxDCBase::DeviceToLogicalX(wxCoord x) const
1141 {
1142 return (wxCoord) (((x) - m_deviceOriginX)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX) - m_logicalOriginX);
1143 }
1144
1145 wxCoord wxDCBase::DeviceToLogicalXRel(wxCoord x) const
1146 {
1147 return (wxCoord) ((x)/(m_logicalScaleX*m_userScaleX*m_signX*m_scaleX));
1148 }
1149
1150 wxCoord wxDCBase::DeviceToLogicalY(wxCoord y) const
1151 {
1152 return (wxCoord) (((y) - m_deviceOriginY)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY) - m_logicalOriginY);
1153 }
1154
1155 wxCoord wxDCBase::DeviceToLogicalYRel(wxCoord y) const
1156 {
1157 return (wxCoord) ((y)/(m_logicalScaleY*m_userScaleY*m_signY*m_scaleY));
1158 }
1159
1160 wxCoord wxDCBase::LogicalToDeviceX(wxCoord x) const
1161 {
1162 return (wxCoord) ((x - m_logicalOriginX)*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX + m_deviceOriginX);
1163 }
1164
1165 wxCoord wxDCBase::LogicalToDeviceXRel(wxCoord x) const
1166 {
1167 return (wxCoord) (x*m_logicalScaleX*m_userScaleX*m_signX*m_scaleX);
1168 }
1169
1170 wxCoord wxDCBase::LogicalToDeviceY(wxCoord y) const
1171 {
1172 return (wxCoord) ((y - m_logicalOriginY)*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY + m_deviceOriginY);
1173 }
1174
1175 wxCoord wxDCBase::LogicalToDeviceYRel(wxCoord y) const
1176 {
1177 return (wxCoord) (y*m_logicalScaleY*m_userScaleY*m_signY*m_scaleY);
1178 }
1179
1180 // ---------------------------------------------------------------------------
1181 // bit blit
1182 // ---------------------------------------------------------------------------
1183 bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest, wxCoord width, wxCoord height,
1184 wxDC *source, wxCoord xsrc, wxCoord ysrc, int rop, bool useMask)
1185 {
1186 wxCoord xdest1 = xdest;
1187 wxCoord ydest1 = ydest;
1188 wxCoord xsrc1 = xsrc;
1189 wxCoord ysrc1 = ysrc;
1190
1191 // Chris Breeze 18/5/98: use text foreground/background colours
1192 // when blitting from 1-bit bitmaps
1193 COLORREF old_textground = ::GetTextColor(GetHdc());
1194 COLORREF old_background = ::GetBkColor(GetHdc());
1195 if (m_textForegroundColour.Ok())
1196 {
1197 ::SetTextColor(GetHdc(), m_textForegroundColour.GetPixel() );
1198 }
1199 if (m_textBackgroundColour.Ok())
1200 {
1201 ::SetBkColor(GetHdc(), m_textBackgroundColour.GetPixel() );
1202 }
1203
1204 DWORD dwRop = rop == wxCOPY ? SRCCOPY :
1205 rop == wxCLEAR ? WHITENESS :
1206 rop == wxSET ? BLACKNESS :
1207 rop == wxINVERT ? DSTINVERT :
1208 rop == wxAND ? MERGECOPY :
1209 rop == wxOR ? MERGEPAINT :
1210 rop == wxSRC_INVERT ? NOTSRCCOPY :
1211 rop == wxXOR ? SRCINVERT :
1212 rop == wxOR_REVERSE ? MERGEPAINT :
1213 rop == wxAND_REVERSE ? SRCERASE :
1214 rop == wxSRC_OR ? SRCPAINT :
1215 rop == wxSRC_AND ? SRCAND :
1216 SRCCOPY;
1217
1218 bool success = TRUE;
1219 if (useMask && source->m_selectedBitmap.Ok() && source->m_selectedBitmap.GetMask())
1220 {
1221
1222 #if 0 // __WIN32__
1223 // Not implemented under Win95 (or maybe a specific device?)
1224 if (MaskBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1225 (HDC) source->m_hDC, xsrc1, ysrc1, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap(),
1226 0, 0, 0xAACC0020))
1227 {
1228 // Success
1229 }
1230 else
1231 #endif
1232 {
1233 // Old code
1234 #if 0
1235 HDC dc_mask = CreateCompatibleDC((HDC) source->m_hDC);
1236 ::SelectObject(dc_mask, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap());
1237 success = (BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1238 dc_mask, xsrc1, ysrc1, 0x00220326 /* NOTSRCAND */) != 0);
1239 success = (BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1240 (HDC) source->m_hDC, xsrc1, ysrc1, SRCPAINT) != 0);
1241 ::SelectObject(dc_mask, 0);
1242 ::DeleteDC(dc_mask);
1243 #endif
1244 // New code from Chris Breeze, 15/7/98
1245 // Blit bitmap with mask
1246
1247 if (IsKindOf(CLASSINFO(wxPrinterDC)))
1248 {
1249 // If we are printing source colours are screen colours
1250 // not printer colours and so we need copy the bitmap
1251 // pixel by pixel.
1252 RECT rect;
1253 HDC dc_mask = ::CreateCompatibleDC((HDC) source->m_hDC);
1254 HDC dc_src = (HDC) source->m_hDC;
1255
1256 ::SelectObject(dc_mask, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap());
1257 for (int x = 0; x < width; x++)
1258 {
1259 for (int y = 0; y < height; y++)
1260 {
1261 COLORREF cref = ::GetPixel(dc_mask, x, y);
1262 if (cref)
1263 {
1264 HBRUSH brush = ::CreateSolidBrush(::GetPixel(dc_src, x, y));
1265 rect.left = xdest1 + x; rect.right = rect.left + 1;
1266 rect.top = ydest1 + y; rect.bottom = rect.top + 1;
1267 ::FillRect(GetHdc(), &rect, brush);
1268 ::DeleteObject(brush);
1269 }
1270 }
1271 }
1272 ::SelectObject(dc_mask, 0);
1273 ::DeleteDC(dc_mask);
1274 }
1275 else
1276 {
1277 // create a temp buffer bitmap and DCs to access it and the mask
1278 HDC dc_mask = ::CreateCompatibleDC((HDC) source->m_hDC);
1279 HDC dc_buffer = ::CreateCompatibleDC(GetHdc());
1280 HBITMAP buffer_bmap = ::CreateCompatibleBitmap(GetHdc(), width, height);
1281 ::SelectObject(dc_mask, (HBITMAP) source->m_selectedBitmap.GetMask()->GetMaskBitmap());
1282 ::SelectObject(dc_buffer, buffer_bmap);
1283
1284 // copy dest to buffer
1285 ::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1286 GetHdc(), xdest1, ydest1, SRCCOPY);
1287
1288 // copy src to buffer using selected raster op
1289 ::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1290 (HDC) source->m_hDC, xsrc1, ysrc1, dwRop);
1291
1292 // set masked area in buffer to BLACK (pixel value 0)
1293 COLORREF prevBkCol = ::SetBkColor(GetHdc(), RGB(255, 255, 255));
1294 COLORREF prevCol = ::SetTextColor(GetHdc(), RGB(0, 0, 0));
1295 ::BitBlt(dc_buffer, 0, 0, (int)width, (int)height,
1296 dc_mask, xsrc1, ysrc1, SRCAND);
1297
1298 // set unmasked area in dest to BLACK
1299 ::SetBkColor(GetHdc(), RGB(0, 0, 0));
1300 ::SetTextColor(GetHdc(), RGB(255, 255, 255));
1301 ::BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1302 dc_mask, xsrc1, ysrc1, SRCAND);
1303 ::SetBkColor(GetHdc(), prevBkCol); // restore colours to original values
1304 ::SetTextColor(GetHdc(), prevCol);
1305
1306 // OR buffer to dest
1307 success = (::BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height,
1308 dc_buffer, 0, 0, SRCPAINT) != 0);
1309
1310 // tidy up temporary DCs and bitmap
1311 ::SelectObject(dc_mask, 0);
1312 ::DeleteDC(dc_mask);
1313 ::SelectObject(dc_buffer, 0);
1314 ::DeleteDC(dc_buffer);
1315 ::DeleteObject(buffer_bmap);
1316 }
1317 }
1318 }
1319 else
1320 {
1321 if (IsKindOf(CLASSINFO(wxPrinterDC)))
1322 {
1323 // If we are printing, source colours are screen colours
1324 // not printer colours and so we need copy the bitmap
1325 // pixel by pixel.
1326 HDC dc_src = (HDC) source->m_hDC;
1327 RECT rect;
1328 for (int x = 0; x < width; x++)
1329 {
1330 for (int y = 0; y < height; y++)
1331 {
1332 HBRUSH brush = ::CreateSolidBrush(::GetPixel(dc_src, x, y));
1333 rect.left = xdest1 + x; rect.right = rect.left + 1;
1334 rect.top = ydest1 + y; rect.bottom = rect.top + 1;
1335 ::FillRect(GetHdc(), &rect, brush);
1336 ::DeleteObject(brush);
1337 }
1338 }
1339 }
1340 else
1341 {
1342 success = (BitBlt(GetHdc(), xdest1, ydest1, (int)width, (int)height, (HDC) source->m_hDC,
1343 xsrc1, ysrc1, dwRop) != 0);
1344 }
1345 }
1346 ::SetTextColor(GetHdc(), old_textground);
1347 ::SetBkColor(GetHdc(), old_background);
1348
1349 return success;
1350 }
1351
1352 void wxDC::DoGetSize(int *w, int *h) const
1353 {
1354 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZRES);
1355 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTRES);
1356 }
1357
1358 void wxDC::DoGetSizeMM(int *w, int *h) const
1359 {
1360 if ( w ) *w = ::GetDeviceCaps(GetHdc(), HORZSIZE);
1361 if ( h ) *h = ::GetDeviceCaps(GetHdc(), VERTSIZE);
1362 }
1363
1364 wxSize wxDC::GetPPI() const
1365 {
1366 int x = ::GetDeviceCaps(GetHdc(), LOGPIXELSX);
1367 int y = ::GetDeviceCaps(GetHdc(), LOGPIXELSY);
1368
1369 return wxSize(x, y);
1370 }
1371
1372 // For use by wxWindows only, unless custom units are required.
1373 void wxDC::SetLogicalScale(double x, double y)
1374 {
1375 m_logicalScaleX = x;
1376 m_logicalScaleY = y;
1377 }
1378
1379 #if WXWIN_COMPATIBILITY
1380 void wxDC::DoGetTextExtent(const wxString& string, float *x, float *y,
1381 float *descent, float *externalLeading,
1382 wxFont *theFont, bool use16bit) const
1383 {
1384 wxCoord x1, y1, descent1, externalLeading1;
1385 GetTextExtent(string, & x1, & y1, & descent1, & externalLeading1, theFont, use16bit);
1386 *x = x1; *y = y1;
1387 if (descent)
1388 *descent = descent1;
1389 if (externalLeading)
1390 *externalLeading = externalLeading1;
1391 }
1392 #endif
1393
1394 // ---------------------------------------------------------------------------
1395 // spline drawing code
1396 // ---------------------------------------------------------------------------
1397
1398 #if wxUSE_SPLINES
1399
1400 class wxSpline: public wxObject
1401 {
1402 public:
1403 int type;
1404 wxList *points;
1405
1406 wxSpline(wxList *list);
1407 void DeletePoints();
1408
1409 // Doesn't delete points
1410 ~wxSpline();
1411 };
1412
1413 void wx_draw_open_spline(wxDC *dc, wxSpline *spline);
1414
1415 void wx_quadratic_spline(double a1, double b1, double a2, double b2,
1416 double a3, double b3, double a4, double b4);
1417 void wx_clear_stack();
1418 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2, double *x3,
1419 double *y3, double *x4, double *y4);
1420 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3,
1421 double x4, double y4);
1422 static bool wx_spline_add_point(double x, double y);
1423 static void wx_spline_draw_point_array(wxDC *dc);
1424 wxSpline *wx_make_spline(int x1, int y1, int x2, int y2, int x3, int y3);
1425
1426 void wxDC::DoDrawSpline(wxList *list)
1427 {
1428 wxSpline spline(list);
1429
1430 wx_draw_open_spline(this, &spline);
1431 }
1432
1433 wxList wx_spline_point_list;
1434
1435 void wx_draw_open_spline(wxDC *dc, wxSpline *spline)
1436 {
1437 wxPoint *p;
1438 double cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4;
1439 double x1, y1, x2, y2;
1440
1441 wxNode *node = spline->points->First();
1442 p = (wxPoint *)node->Data();
1443
1444 x1 = p->x;
1445 y1 = p->y;
1446
1447 node = node->Next();
1448 p = (wxPoint *)node->Data();
1449
1450 x2 = p->x;
1451 y2 = p->y;
1452 cx1 = (double)((x1 + x2) / 2);
1453 cy1 = (double)((y1 + y2) / 2);
1454 cx2 = (double)((cx1 + x2) / 2);
1455 cy2 = (double)((cy1 + y2) / 2);
1456
1457 wx_spline_add_point(x1, y1);
1458
1459 while ((node = node->Next()) != NULL)
1460 {
1461 p = (wxPoint *)node->Data();
1462 x1 = x2;
1463 y1 = y2;
1464 x2 = p->x;
1465 y2 = p->y;
1466 cx4 = (double)(x1 + x2) / 2;
1467 cy4 = (double)(y1 + y2) / 2;
1468 cx3 = (double)(x1 + cx4) / 2;
1469 cy3 = (double)(y1 + cy4) / 2;
1470
1471 wx_quadratic_spline(cx1, cy1, cx2, cy2, cx3, cy3, cx4, cy4);
1472
1473 cx1 = cx4;
1474 cy1 = cy4;
1475 cx2 = (double)(cx1 + x2) / 2;
1476 cy2 = (double)(cy1 + y2) / 2;
1477 }
1478
1479 wx_spline_add_point((double)wx_round(cx1), (double)wx_round(cy1));
1480 wx_spline_add_point(x2, y2);
1481
1482 wx_spline_draw_point_array(dc);
1483
1484 }
1485
1486 /********************* CURVES FOR SPLINES *****************************
1487
1488 The following spline drawing routine is from
1489
1490 "An Algorithm for High-Speed Curve Generation"
1491 by George Merrill Chaikin,
1492 Computer Graphics and Image Processing, 3, Academic Press,
1493 1974, 346-349.
1494
1495 and
1496
1497 "On Chaikin's Algorithm" by R. F. Riesenfeld,
1498 Computer Graphics and Image Processing, 4, Academic Press,
1499 1975, 304-310.
1500
1501 ***********************************************************************/
1502
1503 #define half(z1, z2) ((z1+z2)/2.0)
1504 #define THRESHOLD 5
1505
1506 /* iterative version */
1507
1508 void wx_quadratic_spline(double a1, double b1, double a2, double b2, double a3, double b3, double a4,
1509 double b4)
1510 {
1511 register double xmid, ymid;
1512 double x1, y1, x2, y2, x3, y3, x4, y4;
1513
1514 wx_clear_stack();
1515 wx_spline_push(a1, b1, a2, b2, a3, b3, a4, b4);
1516
1517 while (wx_spline_pop(&x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4)) {
1518 xmid = (double)half(x2, x3);
1519 ymid = (double)half(y2, y3);
1520 if (fabs(x1 - xmid) < THRESHOLD && fabs(y1 - ymid) < THRESHOLD &&
1521 fabs(xmid - x4) < THRESHOLD && fabs(ymid - y4) < THRESHOLD) {
1522 wx_spline_add_point((double)wx_round(x1), (double)wx_round(y1));
1523 wx_spline_add_point((double)wx_round(xmid), (double)wx_round(ymid));
1524 } else {
1525 wx_spline_push(xmid, ymid, (double)half(xmid, x3), (double)half(ymid, y3),
1526 (double)half(x3, x4), (double)half(y3, y4), x4, y4);
1527 wx_spline_push(x1, y1, (double)half(x1, x2), (double)half(y1, y2),
1528 (double)half(x2, xmid), (double)half(y2, ymid), xmid, ymid);
1529 }
1530 }
1531 }
1532
1533
1534 /* utilities used by spline drawing routines */
1535
1536
1537 typedef struct wx_spline_stack_struct {
1538 double x1, y1, x2, y2, x3, y3, x4, y4;
1539 }
1540 Stack;
1541
1542 #define SPLINE_STACK_DEPTH 20
1543 static Stack wx_spline_stack[SPLINE_STACK_DEPTH];
1544 static Stack *wx_stack_top;
1545 static int wx_stack_count;
1546
1547 void wx_clear_stack()
1548 {
1549 wx_stack_top = wx_spline_stack;
1550 wx_stack_count = 0;
1551 }
1552
1553 void wx_spline_push(double x1, double y1, double x2, double y2, double x3, double y3, double x4, double y4)
1554 {
1555 wx_stack_top->x1 = x1;
1556 wx_stack_top->y1 = y1;
1557 wx_stack_top->x2 = x2;
1558 wx_stack_top->y2 = y2;
1559 wx_stack_top->x3 = x3;
1560 wx_stack_top->y3 = y3;
1561 wx_stack_top->x4 = x4;
1562 wx_stack_top->y4 = y4;
1563 wx_stack_top++;
1564 wx_stack_count++;
1565 }
1566
1567 int wx_spline_pop(double *x1, double *y1, double *x2, double *y2,
1568 double *x3, double *y3, double *x4, double *y4)
1569 {
1570 if (wx_stack_count == 0)
1571 return (0);
1572 wx_stack_top--;
1573 wx_stack_count--;
1574 *x1 = wx_stack_top->x1;
1575 *y1 = wx_stack_top->y1;
1576 *x2 = wx_stack_top->x2;
1577 *y2 = wx_stack_top->y2;
1578 *x3 = wx_stack_top->x3;
1579 *y3 = wx_stack_top->y3;
1580 *x4 = wx_stack_top->x4;
1581 *y4 = wx_stack_top->y4;
1582 return (1);
1583 }
1584
1585 static bool wx_spline_add_point(double x, double y)
1586 {
1587 wxPoint *point = new wxPoint;
1588 point->x = (int) x;
1589 point->y = (int) y;
1590 wx_spline_point_list.Append((wxObject*)point);
1591 return TRUE;
1592 }
1593
1594 static void wx_spline_draw_point_array(wxDC *dc)
1595 {
1596 dc->DrawLines(&wx_spline_point_list, 0, 0);
1597 wxNode *node = wx_spline_point_list.First();
1598 while (node)
1599 {
1600 wxPoint *point = (wxPoint *)node->Data();
1601 delete point;
1602 delete node;
1603 node = wx_spline_point_list.First();
1604 }
1605 }
1606
1607 wxSpline::wxSpline(wxList *list)
1608 {
1609 points = list;
1610 }
1611
1612 wxSpline::~wxSpline()
1613 {
1614 }
1615
1616 void wxSpline::DeletePoints()
1617 {
1618 for(wxNode *node = points->First(); node; node = points->First())
1619 {
1620 wxPoint *point = (wxPoint *)node->Data();
1621 delete point;
1622 delete node;
1623 }
1624 delete points;
1625 }
1626
1627
1628 #endif // wxUSE_SPLINES
1629
wxWidgets (Impactor)